Elegant operator overloading in D

Question

For a while I was confused about the direction of D\'s operator overloading, but now I realize it\'s a beautiful system... if It would only work with core types (int, float, etc

Answer 1

Almost all overloaded operators in D are templates by definition. Notice that void opOpAssign(string op)(Vector vector) has a template parameter which is a string. So, no you can't overload it as a non-template function. Now, you don't need a second template to do it (so if by asking whether you need a template, you mean a helper template, then the answer is no), but the overloaded operator function is already a template.

The canonical way to do what you you're trying to do here is to use string mixins:

void opOpAssign(string op)(Vector vector)
{
    mixin("X" ~ op ~ "=vector.X;");
    mixin("Y" ~ op ~ "=vector.Y;");
}

Answer 2

this is meant to be combined with mixins

void opOpAssign(string op)(Vector vector) {
    mixin("X"~op~"=vector.X;");
    mixin("Y"~op~"=vector.Y;");
}

not to mention this can easily be coupled to other arithmetic operations

Vector opBinary(string op)(Vector l)if(op=="+"||op=="-"){//only addition and subtraction makes sense for 2D vectors
    mixin("return Vector(x"~op~"l.x,y"~op~"l.y;");
}

///take in anything as long as a corresponding binaryOp exists
///this essentially rewrites all "vec op= variable;" to "vec = vec op variable;"
void opOpAssign(string op,T)(T l){
    this  = this.binaryOp!op(l);
}

and even to other scaling the Vector

Vector opBinary(string op)(real l)if(op=="*"||op=="/"){
    mixin("return Vector(x"~op~"l,y"~op~"l;");
}

Vector opBinaryRight(string op)(real l)if(op=="*"){// for 2 * vec
    return this*l;
}

note that the defined opBinarys restrict what can be passed to opOpAssign but you can go both ways (define opBinary in terms of opOpAssign)